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Tridacna Shell: The Giant of the Sea

April 27, 2017 2 min read

Tridacna.

Do you recall the giant shell in Botticelli’s “The Birth of Venus,” the one that Venus stands on as she’s blown onto shore by angels? A clam of that size, while fantastical in a Renaissance painting, does actually exist.

The tridacna gigas is the largest species of clam on the planet, with a lifespan of almost a hundred years and a weight of hundreds of pounds. Its shell and pearls are the whitest natural gemstone on earth. It is also critically endangered.

Their numbers have plummeted since the 1970s due to over-harvesting, mainly for food and aquarium displays. They can still be found in the waters of the Pacific stretching from the Philippines to Micronesia. All tridacna species are protected under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).

The Pearl of Allah (Wikipedia Commons)
The most famous pearl produced by a tridacna gigas is the so-called Pearl of Allah, also known as the Pearl of Laozi. Weighing in at a whopping 14 pounds, this was no “pearl” in the sense that we are familiar with. Pearls from oysters have a nacreous, iridescent glow. Tridacna pearls look like an irregular blob of porcelain—or in the case of the Pearl of Allah, a turbaned head and wizened face. As of 2006, this pearl was valued at $61,850,000, if not for its uncanny resemblance to a sage, then for its status as a record-holder.

The Chinese name for tridacna, “che-qu,” is mentioned in Buddhist scriptures from the Han dynasty as being one of the seven treasures of Buddhism. A common belief is that wearing tridacna jewelry can calm the spirit and remove negative energy, and the beads are sometimes used in rosaries.

Puzzlingly, very little tridacna art or jewelry objects can be found in museums today, though the shells are occasionally sold at auction in their natural form, as pearls, or as tribal artifacts from Pacific Island cultures.

This article is part of the Divine Land Gemstone Compendium, a weekly series by Yun Boutique exploring the gemstones of ancient China and their significance to Chinese culture. See the full series here. Subscribe to the email newsletter to receive future installments.

Produced and edited by Christine Lin. Researched by Ariel Tian.


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